A REVIEW OF THE MYSIDACEA 83 



and projecting wholly beyond the truncate apex, so that there is no 

 terminal lobe to the scale ; no distal suture on the scale. 



Mouth parts and thoracic limbs very similar to the appendages in 

 the genus Gastrosaccm ; endopod of the third to the eighth thoracic 

 limbs (fig. 22, a) with the carpopropodus divided into 10 subjoints; 

 basal joint of the exopods with an acute outer distal corner; oostegite 

 attached to the seventh thoracic limb of the female essentially of the 

 same form as figured by Sars for G. normani. 



Fifth abdominal somite without a dorsal spine. 



Outer uropod (fig. 21, h) slightly shorter than the inner, with 13 

 spines on its outer margin; inner uropod (fig. 21, h) with 6 spines on 

 its inner lower margin, 3 placed in an oblique row near the statocyst, 

 the other 3 longer and stronger spines about the center of the inner 

 margin. 



Telson (fig. 21, g) 2y 2 times as long as broad at the base, with eight 

 or nine spines on each margin, the last two of which are longer and 

 stronger than the remainder and placed close together. 



Pleopods of the female (fig. 22, b-f) all biramous; the first pair 

 (fig. 22, b) with the sympod twice as long as the exopod and endopod, 

 with a group of long plumose setae at the proximal and distal ends of 

 the outer margin; exopod and endopod more or less equal in size; 

 second to fifth pairs (fig. 22, c-f) of pleopods more or less all alike, 

 sympod short, about half or less than half the length of the endopod, 

 exopod in all only about half as long as the endopod. 



First pleopod (fig. 21, b) of the male with the sympod somewhat 

 ovate in shape, twice as long as broad, outer margin fringed with 

 10 long plumose setae; endopod of one joint; exopod of 8 joints. 



Second pleopod (fig. 21, c) of the male with the sympod about as 

 long as the exopod, four times as long as broad ; exopod longer than 

 the endopod, 8-jointed; endopod of seven joints. 



Third pleopod (fig. 21, d) of the male with the sympod slightly 

 longer than the endopod, twice as long as broad; exopod very long 

 and slender, of nine joints, first joint rather long, second, third, and 

 fourth joints short and subequal, fifth joint longer than the fourth; 

 sixth, seventh, and eighth joints long and narrow, ninth joint quite 

 small and terminated by two short plumose setae; endopod of four 

 joints. 



Fourth pleopod (fig. 21, e) of the male with the sympod shorter 

 than the exopod and only slightly longer than the endopod ; exopod 

 of seven joints; endopod 1-jointed. 



Fifth pleopod (fig. 21, /) of the male very similar to the fourth, 

 sympod about as long as the endopod; exopod 6-jointed; endopod 

 1-jointed. 



Length of adult specimens of both sexes, 15 mm. 



